JP2003343344A - Cylinder frame and module scavenging tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scavenging tank and a cylinder frame for a two-stroke large internal combustion engine having compact and flexible assembling processes. <P>SOLUTION: A scavenging tank of a two-stroke large internal combustion engine and cylinder frames 30 and 30' for positioning on the frame 2 of the engine's crankcase are disclosed. A plurality of holes 39 for receiving and supporting the same number of cylinder lines 6 are provided in the upper surfaces of the cylinder frames 30 and 30' and expansion plates 50 extend from sidewalls 32 of the cylinder frames 30 and 30'. The sections 56, 57, 60 and 62 of the scavenging tank are positioned between the expansion plates 50. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

The present invention relates to a scavenging tank of a large two-stroke internal combustion engine and a cylinder frame arranged on a frame of a crankcase of the engine. Such a scavenging tank sends fresh air to the cylinder and is equipped with a turbocharger and an exhaust sump. The cylinder frame forms a support for mounting a cylinder liner, a camshaft housing, and a scavenging tank.

[0002]

[Prior Art] "K98MC Project Guide Two-Stroke Eng
ines ”2nd edition (1999, MNA B & W Diesel AES), the scavenging tank of a two-stroke large internal combustion engine is a cylinder extending over the entire length of the cylinder frame. Formed of an elongated body of. The scavenging tank has a traverse pipe in each cylinder,
Guides scavenging air to the cylinder. The traverse tube has a flange that connects to another flange extending from another traverse tube of the cylinder frame. The scavenging tank is equipped with a turbocharger, an auxiliary blower, an exhaust sump, and a cooler housing containing an air cooler.

A cooler housing for cooling the scavenging air associated with the turbocharger is integrated into the scavenging tank. The cooler housing is part of the scavenging tank and is sufficient to support the weight of the cooler housing itself and the turbocharger during vibration and pressure fluctuations when the engine is operating. It has a stable structure.
The design of the cooler housing is specified by the type of turbocharger used. Therefore, if the scavenging tank is assembled, when the turbocharger model is changed, the newly constructed scavenging tank has to be dismantled to build a new one.

The scavenging tank must be fixed to the cylinder frame as a unit due to its very strong structure, due to its own weight and the weight of the above-mentioned components to be mounted. In this regard, a laterally extending connecting plate is welded between the cylinders to the scavenging tank. The connecting plate has at its end a flange which is bolted to the cylinder frame. Such bolted connections require a large size due to the very heavy weight they carry and are expensive. In addition, the scavenging tank, turbocharger, and exhaust sump are very bulky, significantly affecting the overall width and height of the engine.

The scavenging tank with the turbocharger pedestal and the scavenging cooler housing must be fully assembled before mounting on the cylinder frame. As a result, it is very difficult to change the design of the scavenging tank and its components during engine fabrication. Moreover, the large size makes it impossible to assemble the scavenging tank in a small workshop.

The upper pressing member in such a conventional structure can be connected only to the uppermost portion of the cylinder frame because there is no other point having sufficient strength in the conventional structure. However, this fixed position does not always become the optimum height of the upper pressing member, which causes insufficient strength of the upper pressing member.

[0007]

Based on this background, the object of the present invention is to provide a scavenging tank and a cylinder frame of the type mentioned at the outset to solve the problems mentioned above. This object is achieved by providing a scavenging tank for a large two-stroke internal combustion engine according to claim 1 and a cylinder frame arranged on the frame of the crankcase of the engine. A plurality of circular holes for receiving and supporting the same number of cylinder liners as the holes are provided on the upper surface of the cylinder frame, and the cylinder frame has a first side wall provided with the same number of holes for demanding scavenging. And a plurality of expansion plates extending from the first side wall, whereby at least a portion of the scavenging tank is formed by a compartment disposed between the expansion plates.

By providing an expansion plate on the cylinder frame, the scavenging tank can be divided into small compartments,
It can be manufactured in a relatively small workshop. further,
The scavenging tank does not need to be assembled prior to mounting on the cylinder frame, thus allowing compartments to be replaced with other compartments at a relatively later stage in the engine fabrication process.

By arranging the components of the scavenging tank between the expansion plates of the cylinder frame, the assembled scavenging tank becomes much more stable than the prior art with the same weight. By improving stability,
For example, the cooler housing can be bolted onto the expansion plate of the scavenging tank. As a result, the turbocharger model can be replaced with the cooler housing at any stage of the manufacturing process, and even after engine completion, eliminating the need to build a new scavenging tank. Furthermore, the scavenging tank is large enough to handle the air supplied by the two turbochargers, ie the two turbochargers can share one large cooler housing. A large cooler housing can be attached to one or more compartments of the scavenging tank. The novel scavenging tank and cylinder frame construction can further be configured such that the cooler housing has a diffuser portion, and thus electrical with an impeller inserted in parallel or in series with the turbocharger into the diffuser portion. An auxiliary blower can be installed as a motor.

Since the upper pressing member can be attached at any position along the height of the expansion plate, the expansion plate also serves as a suitable base for attaching the upper pressing member to the cylinder frame. Therefore, the height of the upper pressing member can be easily adjusted according to, for example, the height of the deck.

Advantageously, the expansion wall is provided with holes to allow scavenging air to pass from one compartment to the next.

The scavenging tank can also be constructed in different compartments. Therefore, a relatively complex and dedicated compartment, such as one equipped with a turbocharger, can be manufactured separately. The different compartments can be selected from standard compartments, compartments with turbochargers, compartments with auxiliary blowers, and compartments for communication, where the standard compartments are preferably welded to the cylinder frame, The turbocharger compartment is preferably bolted to the cylinder frame.

Advantageously, the turbocharger compartment comprises a pedestal for the turbocharger and a housing for the scavenging cooler.

In order to increase the overall strength of the cylinder frame and the engine, the cylinder frame can be fitted with two stiffening plates for each expansion wall, the two stiffening plates going from the side wall to the expansion wall. It extends and forms a hollow portion having a generally triangular cross section, in which a stay bolt for fixing the cylinder frame to the crankcase is received.

To improve handling and machining, the horizontal cross section of the scavenging tank and cylinder frame assembly is preferably substantially rectangular.

Another object of the invention is to overcome the above mentioned problems by providing a two-stroke internal combustion engine of the kind mentioned at the outset. This object is achieved by a two-stroke internal combustion engine according to claim 13, wherein the internal combustion engine includes a base plate having a main bearing of a crankshaft, a frame of a crankcase mounted on the base plate, and the crankcase. The cylinder frame and the scavenging tank according to any one of claims 1 to 11 mounted on the frame.

The exhaust gas reservoir can be supported by a support member extending from the expansion plate so as to have a strong and compact structure.

The frame of the crankcase may be provided with a hollow portion for receiving the stay bolt, said hollow portion having a triangular cross section which substantially corresponds to the triangular cross section of the hollow portion of the cylinder frame. Therefore, the overall strength of the engine is improved.

Another object of the invention is to overcome the above mentioned problems by providing a method for constructing a scavenging tank and cylinder frame of a two-stroke internal combustion engine of the kind mentioned at the outset. This object is achieved by providing a method for constructing a scavenging tank and a cylinder frame according to claim 16, which method provides a cylinder frame with a first side wall provided with a hole for the inlet of scavenging air. A step of fixing a plurality of expansion plates to the side wall,
Mounting a compartment forming at least a portion of the scavenging tank between the expanded plates.

From a manufacturing and strength point of view, it is advantageous to weld the compartment to the expansion plate and preferably to the side wall.

In the case of modular production, the compartments can be selected from a group comprising different compartments.

Other objects, features, advantages and characteristics of the cylinder frame according to the present invention will be clarified by the following detailed description.

In the detailed description of this specification described later,
The invention will be described in more detail with reference to exemplary embodiments shown in the accompanying drawings.

[0024]

DETAILED DESCRIPTION OF THE INVENTION The following detailed description describes the invention in terms of preferred embodiments. FIG. 1 shows a conventional engine for purposes of illustration. The illustrated conventional engine is both taller and wider than the engine according to the invention.

FIG. 2 shows a two-stroke single-flow scavenging type large 12-cylinder diesel engine 1, which is constructed from a base plate 7 having a main bearing of a crankshaft 22. The base plate 7 is divided into appropriately sized parts according to available manufacturing equipment. The bed consists of a welded tall longitudinal girder and a transverse transverse gutter with a cast steel bearing support intersecting it with the cast steel bearing support.
The frame 2 of the welded A-shaped crankcase is mounted on the base plate 7. The frame of the crankcase is
It has a stiffener in the form of a transverse plate 9 passing between each cylinder, the stiffener extending in the longitudinal direction of the frame 2 of the crankcase from the tip to the bottom of the frame 2 of the A-shaped crankcase. Since the outer walls 10 are connected to each other, the lateral rigidity of the crankcase 2 is increased.

A vertical guide surface 13 for receiving a lateral force acting on the crosshead 21 is attached to the plate wall 9 by welding, for example. 2 on both sides of the inner wall 9
The guide surfaces 13 are arranged so as to face each other in the lateral direction. The rear side of each guide surface 13 is supported by an auxiliary wall 14 extending in the vertical direction, and the auxiliary wall 14 connects the guide surface to the plate wall 9. As shown, the auxiliary wall 1
4 may be a flat plate member that makes an acute angle with the plate wall, but it is also possible to use an auxiliary wall 14 having a cross section of a quarter of a circle or a quarter of an ellipse in the horizontal direction. That is, the auxiliary wall may extend so as to be substantially perpendicular to the plate wall 9. The guide surface 13, the auxiliary wall 14 and the plate wall 9 form a hollow portion having high torsional rigidity, and the stay bolt is received in the hollow portion.

As best shown in FIG. 7, the two cylinder frames 30 and 30 'are mounted in series at the tip of the frame 2 of the A-shaped crankcase. Each cylinder frame 30, 30 ′ carries the six cylinder liners 6 of the engine 1. Other configurations are naturally possible, such as an engine with three cylinder frames, or an engine with 11 cylinders with a cylinder frame with 5 cylinders and a cylinder frame with 6 cylinders. The cylinder liner 6 is made of alloy cast iron. The top of the cylinder liner 6 has holes for cooling and has a short cooling jacket. The cylinder liner 6 has a scavenging port and is perforated for a cylinder lubricator. The camshaft housing 3 is mounted on one side of each of the cylinder frames 30 and 30 '. The scavenging tank 4 extends along the other side of the cylinder frames 30, 30 '.
The scavenging tank 4 is equipped with a turbocharger unit 8 for compressing the scavenging air and an exhaust reservoir 11 for equalizing the fluctuating pressure from the individual cylinders. The compressor of the turbocharger 8 draws air from the engine room through the air filter, and the compressed air is cooled by the scavenging cooler shared by two or more turbochargers 8. The scavenging cooler comprises a vapor trap, which prevents the condensate from being carried with the air to the scavenging tank and the combustion chamber.

4 and 5, the cylinder frame 3 is shown.
0 is shown. (The cylinder frame 30 'is the same as the cylinder frame 30.) Cylinder frame 30
Comprises two steel plates 32, 33 extending in the longitudinal direction and forming the side walls of the cylinder frames 30, 30 '. Side wall 3
The reference numerals 2 and 33 are connected to each other by steel plates that extend in the lateral direction and form front and rear walls 34 and 35 of the cylinder frame 30. The side walls 32, 33 and the front and rear walls 34,
By welding 35, a hollow structure having a substantially rectangular cross section is formed. Back and front walls 34, 3
The 5 may be tilted towards each other to reduce the weight of the structure (not shown). Auxiliary steel plate 3 extending in the lateral direction
6 are arranged between the cylinders, thus dividing the rectangular cross section of the cylinder frame into square parts.
The lateral auxiliary steel plate 36 is attached to the side wall 3 of the cylinder frame.
Welded to 2, 33. According to another preferred embodiment shown in FIG. 6 (a), further, four steel plates 37 are provided for each cylinder at an angle of approximately 45 degrees with respect to each of the side wall and the auxiliary wall, so that the inside of the cylinder frame is provided. The cross section of is substantially octagonal.

The cylinder frame can be made of normal steel plate or ingot. According to a preferred embodiment, the steel plate forming the cylinder frame is a rolled steel plate. However, the top plate may be constructed of any other weldable material, such as cast steel.

The upper plate 31 for receiving and supporting the cylinder liner 6 has circular holes 39, which form the side walls 32, 33 and the steel plates forming the front and rear walls 34, 35, and the laterally extending auxiliary. It is welded to the steel plate 36. Holes 38 are opened in the side wall 32 so that scavenging air can be sent into the cylinder frame 30 for each cylinder. Further, a pair of holes 40 arranged close to each other is formed in the longitudinal edge of the upper plate 31 to receive the stay bolts 16.

As best shown in FIG. 5, in the preferred embodiment, the sidewalls 32, 33 are sloped toward each other. Therefore, the distance between the side walls 32 and 33 on the upper surface of the cylinder frame 30 is equal to the distance between the walls 32 and 3 on the bottom surface.
Less than 3 distances. The angle of inclination between the top plate 31 and the side walls 32, 33 is preferably between about 2 and about 10 degrees, but can be any angle between 0 and 20 degrees. By arranging the side walls 32 and 33 to be inclined toward each other, it is caused by the bending of the upper plate in response to a large and changing force exerted on the upper plate 31 by the cylinder liner 6 and the stay bolt 16 during engine operation. Mechanical stress is
Reduced at the seam formed by welding between the top plate 31 and the side walls 32, 33.

In another preferred embodiment, as shown in FIGS. 8 and 9 (a), the side walls 32 and 33 are arranged so as to form an angle of 90 degrees with the upper plate 31. Welds 41, 42
The mechanical stresses at the seams between the side walls that occur at the edges are reduced by forming the notches 43,44 extending along the weld. The cross sections of the cutouts 43 and 44 are semicircular. The cross section may be semi-elliptical or the like.

According to another preferred embodiment, FIG.
As best shown in (b), the top plate 31 is connected to the side walls 32, 33 by fillet welds 48. Fillet weld 4
8 and the side walls 32, 33 and the fillet weld 4
At the seam between the upper plate 31 and the upper plate 31, grooves 49, 49 ', which are preferably substantially semicircular, are formed by machining such as grinding to reduce the mechanical stress between each plate and the fillet weld 48. To do.

A flange 45 extends horizontally from the bottoms of the side walls 32 and 33. A vertically extending rib 46 is welded to the side wall 33 facing the camshaft housing 3. The flange 47 for mounting the camshaft housing is the rib 4
It is welded to 6. The support plate 53 is welded to the end of the flange 47 and the side wall 33 and forms a triangular portion for receiving the stay bolt 16. In those engines configured without a camshaft, the support plate 53 is welded to the wall 33 and ribs 46.

An extension plate 50 extending in the transverse direction is welded to the side wall 32 facing the scavenging tank 4. A hole 51 is formed in the expansion plate 50 so that scavenging air can pass therethrough. The plate 52 forming the upper plate of the scavenging tank 4 is the expansion plate 50.
And is welded to the upper plate 31. Reinforcing plates 53 extend from both sides of each expansion plate 50 toward the side walls 32 at an acute angle, and a hollow portion having a substantially triangular cross section is formed on each side of each expansion plate 50. The expansion plate 50, the reinforcing plate 53, and the side wall 32 form a hollow portion having high torsional rigidity and compression rigidity, and the hollow portion receives the retaining bolt 16.

A substantially square bottom plate 54 is welded to the inner surface of the cylinder frame 30. A circular flange 55 for receiving the packing box of the piston rod is welded to a corresponding hole in the center of the bottom plate 54.

The cylinder frames 30, 30 'and the base plate 7 are located inside the hollow portion of the cylinder frame and the hollow portion of the frame 2 of the A-shaped crankcase.
It is fixed by a set of two retaining bolts 16 extending from the upper plate 31 of the cylinder frame 30, 30 'to the bottom of the frame 2 of the A-shaped crankcase and arranged close to each other. Therefore, these hollow portions function as paths for the retaining bolts and are required to withstand the large and varying compressive forces transmitted by the retaining bolts to the frame box 2 and the cylinder frames 30, 30 'when the engine 1 is operating. Cylinder frame 3 for compressive rigidity
0, 30 'and A-shaped frame boxes 2 are provided. The lower end of the stay bolt 16 is appropriately fixed to the screw hole in the upper portion of the base plate 7. Cylinder frame 30, 30 '
It is preferable that the hollow portion of the crankcase and the hollow portion of the frame 2 of the crankcase have the same cross section, and the hollow portion of the cylinder frame is arranged directly above the hollow portion of the frame 2 of the crankcase. As best shown in FIG. 5, the hollow portion on the side of the camshaft housing on the cylinder frame 30, 30 ′ may be “blocked” by a flange 47 for mounting the camshaft housing 3.

As best shown in FIG. 7, a C-shaped plate 5
6 form each section of the scavenging tank 4, and are welded between the expansion plates 50. Therefore, the internal space of the scavenging tank 4 is enclosed. Therefore, the side walls 32 of the cylinder frames 30, 30 ′ also form the side walls of the scavenging tank 4. By utilizing the side wall 32 as the side wall of both the scavenging tank 4 and the cylinder frames 30, 30 ', the scavenging tank 4 and the cylinder frames 30, 30' become a very small device. This is particularly advantageous because the turbocharger 8 can be arranged at a low position and therefore the exhaust sump 11 can be arranged at a low position to reduce the overall height of the engine 1.
The exhaust sump 11 is mounted on a bracket 63 placed directly on the expansion plate 50. Since the turbocharger 8 and the exhaust sump 11 are relatively low, the natural frequency of the entire exhaust sump device increases. When the rigidity of the exhaust gas reservoir 11 is increased, the exhaust gas reservoir 11 can be divided into smaller units, so that the manufacturing cost can be reduced.

The scavenging tank 4 is constructed from a number of different compartments. Each cylinder frame has one or two for mounting the turbocharger 8 and the cooler housing 58.
It comprises one dedicated compartment 57. The compartment 57 with the turbocharger is a welded design, with a flat top plate and a hole in the bottom for receiving the air exiting the cooler. The cooler housing includes a top plate with holes for receiving compressed air exiting the turbocharger and is attached to the expansion plate by bolts or welding. The flange of the turbocharger 8 is bolted to the top plate of the cooler housing 58. An intercooler in the form of a heat exchanger is arranged inside the cooler housing. The cooler housing may extend across multiple compartments of the scavenging tank and may include and serve one or more turbochargers (not shown).
Another dedicated compartment 60 of the scavenging tank 4 comprises an inlet for an auxiliary blower 61. The cooler housing 58 can be shaped to have a diffuser, so that an auxiliary blower can be installed as an electric motor with an impeller inserted in the diffuser part in parallel or in series with the turbocharger 8.

The scavenging tank 4 is constructed from 12 compartments. There are six standard C-shaped compartments 56, three compartments 57 with a turbocharger, and three auxiliary blower compartments 60.
The scavenging tank 4 has two cylinder frames 30, 30 '.
A single circular connecting section 62 arranged in series between the outer expansion plates 50 of the two cylinder frames 30, 3
0's are connected. By welding the compartments between the expansion plates, the cylinder frame and the scavenging tank can form a rigid and stable integral structure.

By using a modular design for the scavenging tank 4, the individual compartments can be made in a relatively small workshop.

The upper bracing 71 connecting the engine to the side wall (not shown) of the engine room (see FIG. 2) is an expansion plate 50.
Are linked to. The expansion plate 50 can be attached to the upper bracing at any position along the vertical expansion of the expansion plate. Therefore, the height of the upper bracing can be easily adjusted according to, for example, the height of the deck of the engine room.

As best shown in FIG. 11, the cross sections of the cylinder frames 30 and 30 'on which the scavenging tank 4 is mounted are substantially rectangular, and are suitable for handling and machining during manufacture.

Although the present invention has been described in detail above for purposes of illustration, such details are for purposes of illustration only and modifications may be made without departing from the scope of the invention.

Thus, while the preferred embodiments of the apparatus and method have been described with reference to the developed context, the embodiments are merely illustrative of the principles of the invention. Other embodiments and configurations may be devised without departing from the spirit and scope of the invention.

[Brief description of drawings]

1 is a cross-sectional view of a conventional engine.

FIG. 2 is a sectional view of an engine according to the present invention.

FIG. 3 is a partially enlarged view of FIG. 1, showing a cross section of the engine taken along line Ib-Ib.

FIG. 4 is a perspective view of a cylinder frame.

FIG. 5 is a partial sectional view of an upper portion of a cylinder frame.

6 (a) and 6 (b) are cross-sectional views of another configuration of the cylinder frame.

FIG. 7 is a perspective view of a scavenging tank mounted on a cylinder frame.

FIG. 8 is a sectional view showing details of a cylinder frame and a scavenging tank.

FIG. 9 (a) shows details of a weld with a stress reducing notch. FIG. 9 (b) shows details of the weld with grooves that reduce stress.

FIG. 10 is a more detailed cross-sectional view of another configuration of the cylinder frame and the scavenging tank.

FIG. 11 is a perspective view of a cylinder frame and a scavenging tank, showing an appearance of a combined body thereof.

[Simple explanation of symbols]

1 2 stroke type single flow scavenging type large 12 cylinder internal combustion engine 2 crankcase, crankcase frame,
Frame box 3 Camshaft housing 4 Scavenging tank 6 Cylinder liner 7 Base plate 8 Turbocharger 9 Horizontal plate, plate wall 10 Outer wall 11 extending in the length direction of frame 2 of crankcase 11 Exhaust sump 13 Guide surface 14 Auxiliary wall 16 Rest bolt 21 crosshead 22 crankshaft 30, 30 'cylinder frame 31 upper plates 32, 33 side wall 34 front wall 35 rear wall 36 laterally extending auxiliary steel plate 37 steel plate 38 side wall 32 hole 39 circular hole 40 Holes 41, 42 Welds 43, 44 Notches 45 Flange 46 Ribs 47 Flange 48 Fillet welds 49, 49 'Semicircular groove 50 Expansion plate 51 Hole 52 Top plate 53 of scavenging tank 4 Support plate, reinforcement plate, Reinforcement wall 54 Bottom plate 55 Circular flange 56 C-shaped plate, C-shaped compartment, standard compartment 57 Dedicated compartment, compartment for mounting turbocharger 58却器 housing 60 only partition, the auxiliary blowers partition 61 auxiliary blowers 62 circular contact zone 63 the bracket, the support member 71 the upper bracing

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Jens Rasman             Gentofte 2820, Kell, Denmark             Mindvey 37 F-term (reference) 3G005 DA04 EA16 FA54                 3G024 AA21 BA00 CA19 DA08 DA14                       DA18 DA25 EA10 FA14 FA15

Claims (19)

[Claims] 1. A scavenging tank (4) for use in a two-stroke large internal combustion engine, and a cylinder frame (3) for placement on a frame (2) of the crankcase of the engine.
0, 30 ') and the cylinder frame (30, 3'
0 ') upper plate is provided with a plurality of circular holes (39) for receiving and supporting the same number of cylinder liners (6),
The cylinder frame (30, 30 ') further comprises a first side wall (32, 33) having an equal number of holes (38) for receiving scavenging air, from the first side wall (32) a plurality of expansion plates. An air tank (4) and a cylinder frame (4), characterized in that (50) extends such that at least a part of the scavenging tank is formed by the compartments (56, 57, 60, 62) arranged between the expansion plates. 30, 30 '). 2. The scavenging tank and cylinder frame according to claim 1, wherein the expansion wall is provided with holes to allow scavenging air to pass from one compartment to the next. 3. The scavenging air tank comprises a plurality of different compartments (5).
6, 57, 60, 62), preferably the compartments are welded to the cylinder frame to form an integral, stable cylinder frame (30, 30 ') and scavenging tank. The scavenging tank and the cylinder frame according to claim 2. 4. The plurality of different compartments are a standard compartment (56), a compartment with a turbocharger (57), a compartment with an auxiliary blower (60), and a compartment for communication (62). The scavenging tank and the cylinder frame according to claim 3, further comprising: 5. The compartment (5) equipped with the turbocharger.
Scavenging tank and cylinder frame according to claim 4, characterized in that 7) is provided with a hole for receiving scavenging air. 6. The cooler housing is mounted on an expansion plate (50) adjacent to the compartment (57) in which the turbocharger is mounted, wherein preferably the turbocharger (8) is the cooling device. The scavenging tank and the cylinder frame according to claim 5, wherein the scavenging tank and the cylinder frame are mounted on a vessel housing. 7. The cooler housing (58) includes a plurality of the compartments (56, 57, 60, 62) of the scavenging tank.
The scavenging tank and the cylinder frame according to claim 6, wherein the scavenging tank and the cylinder frame extend over the entire length. 8. Scavenging tank and cylinder according to any one of the preceding claims, characterized in that two or more turbochargers (8) share one cooler housing (58). flame. 9. Two reinforcing walls (5) for each expansion plate (50).
3), wherein the reinforcing wall (53) extends from the side walls (32, 33) to the expansion plate (50) to form a hollow portion having a substantially triangular cross section, and the hollow portion includes 9. Scavenging tank and cylinder frame according to any one of the preceding claims, which receives a stay bolt (16) for attaching the cylinder frame (30, 30 ') to the frame (2) of the crankcase. 10. The upper plate (31) is arranged in close proximity to each other for receiving the stay bolts (16).
Scavenging tank and cylinder frame according to any one of the preceding claims, characterized in that a set of holes (40) is provided. 11. A scavenging tank and a cylinder frame (3
Scavenging tank and cylinder frame according to any one of claims 1 to 10, characterized in that the assembly 0, 30 ') forms a configuration in which the horizontal cross section is substantially rectangular. 12. Scavenging tank and cylinder frame according to any one of the preceding claims, characterized in that the diffuser of the auxiliary blower (61) is part of the cooler housing (58). 13. A two-stroke internal combustion engine comprising a base plate (7) having a main bearing for a crankshaft (22) and a crankcase frame (2) mounted on the base plate. An internal combustion engine, wherein the cylinder frame and the scavenging tank according to any one of 1 to 7 are mounted on a frame (2) of the crankcase. 14. The two-stroke internal combustion engine according to claim 13, further comprising an exhaust sump (11) supported by a support member (63) extending from the expansion plate (50). 15. Frame (2) for the crankcase
Has a hollow portion for receiving a retaining bolt (16), said hollow portion comprising said cylinder frame (30,3).
15. A two-stroke internal combustion engine according to claim 13 or 14, characterized in that it has a triangular cross section which substantially corresponds to the triangular cross section of the hollow part of 0 '). 16. A method for constructing a scavenging tank and a cylinder frame (30, 30 ') of a two-stroke large internal combustion engine, the hole (38) for receiving scavenging air.
Providing a cylinder frame (30, 30 ') having a first sidewall (32) having a plurality of expansion plates (5).
0) to the side wall (32) and to the compartments (56, 57, 60, 62) forming at least part of the scavenging tank between the expansion plates (50). 17. The compartments (56, 57, 60, 62)
The method of claim 16, further comprising welding a plate to the expansion plate (50). 18. The compartments (56, 57, 60, 62)
18. The method of claim 17, further comprising welding a to the side wall (32). 19. The compartments (56, 57, 60, 62)
19. The method of claim 18 including the step of selecting from a group containing different partitions.